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OpenStudy (anonymous):
Which of the following is a correctly balanced equation? A. 2Cu + O2 --> 2CuO B. Mg + O2 --> MgO2 C. 3KCl + HNO3 --> 3HCl + KNO3 D. CaCO3 --> CaO + CO3
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OpenStudy (anonymous):
c and d are the only ones that aren't correctly balanced
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